Hooking up amp with factory amp already Installed?

[Smittster217]

So have a 2001 durango and it has the infinity sound system installed. Head unit to 120 watt amp to speakers. I have found a head unit that will work with the infinity system and the steering wheel controls. Question is if I hook up new head unit and plug rca in for amp in trunk will the existing amp effect it? Should I rip out factory amp and find a head unit that will produce the same power as amp?

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[NuckinFutz 10+ year member]

If youre totally bypassing the factory amp and wiring then it wont affect it.

 

[Smittster217]

What If I was to just hook rca and remote from amp in trunk to new head unit without by passing? Factory amp gets signal from speaker wire and amp in trunk from rca? Would one not work if I hooked up new amp as normal?